OEM Cadillac DTS Engine Control Module

Cadillac DTS Engine Control Module Parts Questions & Experts Answers

• PCM
  12678511
  Q: How to replace the Engine Control Module (ECM) on Cadillac DTS?

  A: The Engine Control Module (ECM) replacement process begins by cutting power to the system through the negative Battery Cable disconnect and moving past engine ignition status. A scan tool should be used to retrieve engine oil and automatic transaxle fluid life percentages for recording purposes. The first step involves separating the engine harness electrical connector from the mass air flow/intake air temperature (MAF/IAT) sensor as well as the positive crankcase ventilation (PCV) fresh air tube quick connect fitting from the air duct and the secondary air injection (AIR) pump inlet tube quick connect fitting from the air cleaner upper housing. Remove the Throttle Body outlet duct by loosening it before removing the clips from the lower housing and front tabs from the upper housing to take away the air cleaner upper housing. The process continues with removing electrical connectors from the ecm after disconnecting lever locks at the ecm. Lastly, the technician pulls out the ecm from the air cleaner lower housing. The installation of the new ecm requires caution to check whether the air filter/ecm housing assembly contains any debris or if the maf/iat sensor inlet screen shows damage alongside examining the housing assembly and intake air duct for overall integrity. After inserting the new ecm into the lower air cleaner housing users should connect the engine harness electrical connectors while simultaneously locking the lever contacts. The installation requires the air cleaner upper housing to lock its front tabs with the lower housing before securing the lower housing clips. Secure the air cleaner outlet duct to the Throttle Body with a clamp which should be tightened to 3 n.m (27 lb in). The engineer should couple the air pump inlet tube quick connect fitting to the upper housing of the air cleaner while using the pcv fresh air tube quick connect fitting to attach to the air ducting. The engine harness electrical connector should be reattached to the maf/iat sensor while reconnecting the negative Battery Cable. Ryan must program the ecm after checking that the setup is accurate.